The Holland Computing Center supports a diverse collection of research computing hardware. Anyone in the University of Nebraska system is welcome to apply for an account on HCC machines.

Access to these resources is by default shared with the rest of the user community via various job schedulers. These policies may be found on the pages for the various resources. Alternatively, a user may buy into an existing resource, acquiring 'priority access'. Finally, several machines are available via Condor for opportunistic use. This will allow users almost immediate access, but the job is subject to preemption.

Which Cluster to Use?

Crane: Crane is the newest and most powerful HCC resource . If you are new to using HCC resources, Crane is the recommended cluster to use initially. Limitations: Crane has only 2 CPU/16 cores and 64GB RAM per node. If your job requires more than 16 cores per node or you need more than 64GB of memory, consider using Tusker instead.

Tusker: Similar to Crane, Tusker is another cluster shared by all campus users. It has 4 CPU/ 64 cores and 256GB RAM per nodes. Two nodes have 512GB RAM for very large memory jobs. So for jobs requiring more than 16 cores per node or large memory, Tusker would be a better option.

Sandhills: Sandhills is a condominium-style cluster, and the majority is owned by various research groups on campus. Jobs from resource owners have first priority in their owned partitions. Users that do not own resources (Guests) can do opportunistic computation, but we would recommend using Crane or Tusker.